Bugs Bower is a legendary name in the jazz trumpet literature community. His book “Chords & Progressions” includes all popular progressive chord progressions, substitute and chromatic progressions, fill-in progressions, harmonic extensions, and blues progressions. This long and detailed look at these chord progressions gives a seasoned jazz musician a wonderful tool for honing their skills and gives a novice improv student a wealth of information along with strategies to help them along their path of study.